Have discovered my Mac OS X address book in Thunderbird has many, many old addresses and also duplicates. Am finding that the Mac OS X address book is a "read-only" in Thunderbird. Is there anyway to change this setting so I am able to clean up this address book and delete old addresses? Read one article which talked about accessing the Mac OS X address book through my operating system but unfortunately was not able to locate this address book under Finder. Appreciate any help cleaning this mess up. Thanks in advance.